
using System.Text;

public class StringUtils
{
    public static string AppendString(params object[] args)
    {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < args.Length; i++)
        {
            sb.Append(args[i]);
        }
        return sb.ToString();
    }

    public static string AppendStringFormat(string format, params object[] args)
    {
        StringBuilder sb = new StringBuilder();
        sb.AppendFormat(format, args);
        return sb.ToString();
    }

}
